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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5ee1f6c5d532d42c90c93f4b4029a238f08401b7e3aa0b923f9540113d428cf' 
  AND token = 'LDxWEACh29wjqbqBwFGq2i5nUJlBA2m0pFoWEHmxkiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}